session_start function creates a session or resumes the current one based on the current session id that is being passed via a request like GET, POST, or a cookie. For using named session, first you will have to call session_name() before calling session_start(). The session_start function returns TRUE if the session starts successfully otherwise it returns FALSE.
echo "your session ID is ".session_id();
In the output, you will get your session ID.
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